It is not clear who is meant by GŁttler. It could be:
- J. GŁttler - unknown composer, mentioned on www.musikland-tirol.at (see below: source)
or
- Hermann GŁttler (07/10/1887 - 20/04/1963), a German composer (from Koenigsberg-Kaliningrad). He wrote two Operas, three Symphonies, one
Piano-concert, one Violin-concert, etc. A requiem is not mentioned.